If you want 5 to 10 mph faster on top end get a good fairing .. when you duck down behind it ,,, your find the bike will go way quicker ..
On small bikes it makes all the difference.
In like 77 almost every guy living on the housing estate I live in the UK had an RD250 .. we all got them new and used to race down the high all on the tank ..
fast 90mph then a slow creep to 100mph and that was it on a stock bike ..
One of my buddy’s got a full fairing it was amazing he just lost us from about 80mph and was hitting 112mph some time 115mph … bolt on speed .
At the time it was expensive they where all fiberglass.. not this cheap nice plastic we get now .. the bikes where 700 pounds about $850 bucks at the time .. the fairing was 250 pounds … that’s a lot of money at the time ..
It you get a good Chinese plastic cop pit fairing on a moped that can do speeds over 50mph it will give you more top end .. cheap and no fear of F ing up your motor .
The black fairing was only $50 I think and the white one a lot bigger and not cheap plastic.. it’s was heavy compared it was like $199 ..